QMED Machinist / Pump Technician Practice Test

Lathes, drills and pipe work, plus pumps, seals and valves. Coast Guard exam code QMED05.

124 real questions from the Coast Guard National Maritime Center's public sample exams, free. Each module needs 70% to pass.

Passing score: Coast Guard pass marks module by module, and the retest rules

What's free: daily rounds, the Brig, the drills and the Pass Meter, for every license. Your first module test is free too. After that, the full Exam Room is $19, once. No subscription.

What's on the test

10 sample questions

1. While fires are lit in a boiler, in terms of uptake dampers and air register doors, what conditions must be met?

   • A.All uptake dampers should be throttled according to the firing rate, all air register doors on lit burners should be wide open, and all air register doors on idle burners should be closed.
   • B.All uptake dampers should be locked open, all air register doors on lit burners should be wide open or throttled, and all air register doors on idle burners should be closed.
   • C.All uptake dampers should be throttled according to the firing rate, all air register doors on lit burners should be throttled according to the firing rate, and all air register doors on idle burners should be closed.
   • D.All uptake dampers should be locked open, all air register doors on lit burners should be throttled according to the firing rate, and all air register doors on idle burners should be open.
   Show answer

   B. All uptake dampers should be locked open, all air register doors on lit burners should be wide open or throttled, and all air register doors on idle burners should be closed.

   Q800, Junior Engineer, Part I

2. The load is always placed on the lower half of the main bearings in a __________.

   • A.two-stroke cycle engine
   • B.four-stroke cycle engine
   • C.reverse cycle engine
   • D.double acting engine
   Show answer

   A. two-stroke cycle engine

   Q800, Junior Engineer, Part I

3. One function of the air receiver in a compressed air system is to __________.

   • A.receive exhaust air from pneumatic accessories
   • B.minimize the system's line pulsations
   • C.remove all traces of oil from the air
   • D.dry the air discharged from the intercooler
   Show answer

   B. minimize the system's line pulsations

   Q800, Junior Engineer, Part I

4. In terms of the completeness of combustion, in performing a stack gas analysis on an operating boiler, what would be the indication of the LEAST complete combustion?

   • A.Relatively high CO2 percentage and relatively high CO percentage.
   • B.Relatively low CO2 percentage and relatively high CO percentage.
   • C.Relatively low CO2 percentage and relatively low CO percentage.
   • D.Relatively high CO2 percentage and relatively low CO percentage.
   Show answer

   B. Relatively low CO2 percentage and relatively high CO percentage.

   Q800, Junior Engineer, Part I

5. The component in an inert gas system used for cleaning the gas of solid and sulfur combustion products, while simultaneously cooling the inert gas, is called the __________.

   • A.filter
   • B.purifier
   • C.cooler
   • D.scrubber
   Show answer

   D. scrubber

   Q801, Junior Engineer, Part II

6. The cubic inch (or liter) displacement of a cylinder is determined by the diameter of the piston and the __________.

   • A.length of the crankshaft
   • B.volume of the clearance space
   • C.weight of the piston
   • D.length of the stroke
   Show answer

   D. length of the stroke

   Q800, Junior Engineer, Part I

7. Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard?

   • A.a voltage tester with a high input impedance and a voltage rating higher than any expected measured voltages
   • B.a voltage tester with a low input impedance and a lower voltage rating than any expected measured voltages
   • C.a voltage tester with a low input impedance and a higher voltage rating than any expected measured voltages
   • D.a voltage tester with a high input impedance and a lower voltage rating than any expected measured voltages
   Show answer

   A. a voltage tester with a high input impedance and a voltage rating higher than any expected measured voltages

   Q801, Junior Engineer, Part II

8. Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?

   • A.Conduction
   • B.Radiation
   • C.Lamination
   • D.All of the above
   Show answer

   B. Radiation

   Q800, Junior Engineer, Part I

9. Which of the following statements is correct concerning antifriction bearings installed on pumps?

   • A.They are usually pressed onto their shafts.
   • B.The inner race should be free to turn on the shaft.
   • C.Alignment is not a critical factor in their installation.
   • D.The outer race should be free to turn in its housing.
   Show answer

   A. They are usually pressed onto their shafts.

   Q801, Junior Engineer, Part II

10. Before primers and finish coats may be applied to a metal surface, the surface must be properly prepared. What statement is true concerning surface preparation?

    • A.All dirt, rust and mill scale must be removed. Oil and grease can remain.
    • B.All dirt, oil, grease, rust, mill scale, and loose paint must be removed.
    • C.All previous paint must be removed.
    • D.Dirt, oil and grease must be removed. Rust and mill scale may remain.
    Show answer

    B. All dirt, oil, grease, rust, mill scale, and loose paint must be removed.

    Q802, Electrician

What the study guide does

• Short daily rounds of 10 questions, with a streak.
• Practice tests built like the real one, scored with the real pass marks (first one free, then $19 once for the full Exam Room).
• The Brig: questions you miss come back until you get them right twice.
• Pass Meter: your chance of passing every module if you sat it today, worked out from your own answers.